/* $OpenBSD: md_init.h,v 1.12 2023/11/18 16:26:16 deraadt Exp $ */

/*-
 * Copyright (c) 2001 Ross Harvey
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the NetBSD
 *      Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#define MD_SECT_CALL_FUNC(section, func) \
        __asm (".section "#section", \"ax\"\n"  \
        "       bl " #func "\n"         \
        "       .previous")

#define MD_SECTION_PROLOGUE(sect, entry_pt)     \
        __asm (                                 \
        ".section "#sect",\"ax\",@progbits      \n" \
        "       .globl " #entry_pt "            \n" \
        "       .type " #entry_pt ",@function   \n" \
        "       .align 4                        \n" \
        #entry_pt":                             \n" \
        "       stwu    %r1,-16(%r1)            \n" \
        "       mflr    %r0                     \n" \
        "       stw     %r0,12(%r1)             \n" \
        "       /* fall thru */                 \n" \
        "       .previous")


#define MD_SECTION_EPILOGUE(sect)               \
        __asm (                                 \
        ".section "#sect",\"ax\",@progbits      \n" \
        "       lwz     %r0,12(%r1)             \n" \
        "       mtlr    %r0                     \n" \
        "       addi    %r1,%r1,16              \n" \
        "       blr                             \n" \
        "       .previous")

#define MD_CRT0_START                                                   \
__asm(                                                                  \
"       .text                                                           \n" \
"       .section        \".text\"                                       \n" \
"       .align 2                                                        \n" \
"       .globl  _start                                                  \n" \
"       .type   _start, @function                                       \n" \
"       .globl  __start                                                 \n" \
"       .type   __start, @function                                      \n" \
"_start:                                                                \n" \
"__start:                                                               \n" \
"       # put cleanup in r6 instead of r7                               \n" \
"       mr %r6, %r7                                                     \n" \
"       b ___start                                                      \n" \
)

#define MD_RCRT0_START                                                  \
__asm(                                                                  \
"       .text                                                           \n" \
"       .section        \".text\"                                       \n" \
"       .align 2                                                        \n" \
"       .globl  _start                                                  \n" \
"       .type   _start, @function                                       \n" \
"       .globl  __start                                                 \n" \
"       .type   __start, @function                                      \n" \
"_start:                                                                \n" \
"__start:                                                               \n" \
"       mr      %r19, %r1               # save stack in r19             \n" \
"       stwu    1, (-16 -((9+3)*4))(%r1) # allocate dl_data             \n" \
"                                                                       \n" \
"       # move argument registers to saved registers for startup flush  \n" \
"       mr %r20, %r3                    # argc                          \n" \
"       mr %r21, %r4                    # argv                          \n" \
"       mr %r22, %r5                    # envp                          \n" \
"       mflr    %r27    /* save off old link register */                \n" \
"       stw     %r27, 4(%r19)           # save in normal location       \n" \
"                                                                       \n" \
"       bcl     20, 31, 1f                                              \n" \
"1:     mflr    %r18                                                    \n" \
"       addis   %r18, %r18, _DYNAMIC-1b@ha                              \n" \
"       addi    %r18, %r18, _DYNAMIC-1b@l                               \n" \
"                                                                       \n" \
"       subi    %r3, %r21, 4    # Get stack pointer (arg0 for _dl_boot). \n" \
"       addi    %r4, %r1, 8     # dl_data                               \n" \
"       mr      %r5, %r18       # dynamicp                              \n" \
"                                                                       \n" \
"       bl      _dl_boot_bind@local                                     \n" \
"                                                                       \n" \
"       mtlr %r27                                                       \n" \
"       # move argument registers back from saved registers             \n" \
"       mr %r3, %r20                                                    \n" \
"       mr %r4, %r21                                                    \n" \
"       mr %r5, %r22                                                    \n" \
"       li %r6, 0                                                       \n" \
"       b ___start                                                      \n" \
"                                                                       \n" \
"       .text                                                           \n" \
"       .align 2                                                        \n" \
"       .globl  _csu_abort                                              \n" \
"       .type   _csu_abort, @function                                   \n" \
"_csu_abort:                                                            \n" \
"       .long 0 # illegal                                               \n" \
)